Introduction to San Francisco Flower Street: Here is a mini version of the most crooked street in the world - San Francisco Flower Street, also known as Jiuqu Flower Street. It is a street in San Francisco, California, USA. The road is long and winding, and the streets are covered with flowers and trees, hence its name. Visitors can walk along the road to the top of the slope and enjoy the beautiful scenery of Foreigner Street.